The current documentation for the API can be found here : spil.com/html5docs. The API is kept compatible with the documentation listed there. There are also tutorials available that you can use as a starting point.
If you want to test your game, try the on-line test tool: cdn.gameplayer.io/testtool/index.html Just put your game somewhere (any webserver, even localhost, will do) and you're good to go. The tool will provide feedback on your API integration.
On the test tool page there's also a Support tab, where you can directly create tickets with the Tech Support crew, who aim to help you find answers. Put in a screenshot of whatever problem you're having and we'd be happy to help you be on your way as fast as possible.
EDIT: Links were removed from my post... added back again